Today the impact of green intellectual capital on organizational sustainability have to be studied because of rising environmental concerns. There are three components of the green intellectual capital (GIC) which include green relational capital (GRC), green human capital (GHC) and green structural capital (GSC). This study fundamentally related to GIC three dimensions and business sustainability. Data from 238 SMEs in Thailand were collected and analyzed through PLS-PM method. Findings discovered that GHC does not have any influence on sustainability, but GSC and GRC are significantly related with sustainability of businesses.